- Amateur Astronomers Association of Pittsburgh
- Provides details about Wagman and Mingo Creek Park observatories, including the equipment used with pictures.
- Astronomical Society of Harrisburg
- Features instructional course offerings, club projects and published books. Also includes photo collection, news articles and weather forecasts.
- Astronomy Club
- Provides details about instruments, organized activities and public observing sessions of the group.
- Berks County Amateur Astronomical Society
- Shows collection of articles about the mythology of constellations. Also contains lists of books, magazines and audio-visual materials.
- Bucks-Mont Astronomical Association
- Posts messages and topic discussions about solar activity updates and interesting observations. Also shows compilations of newsletters and photos.
- Central Pennsylvania Observers
- Provides information on meeting schedules, membership privileges, calendar of activities and e-mail lists.
- Chesmont Astronomical Society
- Features topic discussions, activity reports, articles and newsletters associated with the study. Also accepts comments, questions and discussions for posting.
- Chester County Astronomical Society
- Details course offerings, organized events and awards of the club. Also contains archives of newsletter and photos of space missions.
- Oil Region Astronomical Society
- Presents suggestions on cleaning of optical surfaces and purchasing of telescopes. Also features celestial photos, membership information and events calendar.
- Rittenhouse Astronomical Society
- Presents accounts about the history of the organization, its observatories and schedules of meetings.
- York County Astronomical Society
- Provides details about telescope clinic, course offerings and schedule of activities. Also features science fact and fiction quiz in the area of space exploration.
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